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(a) The illustration of structural change of hydrated MIL-53(Cr) using in situ X-ray diffraction with respect to the pressure cycle of CO2; (b) Schematic diagram of corresponding breathing behavior of MIL-53(Cr). Reprinted with permission from [86]. Copyright 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
